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Biodegradation of p-cresol by aerobic granules in sequencing batch reactor

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Journal of Environmental Sciences 2012年第11期24卷 2012-2027页

作者： Farrukh Basheer i.h.Farooqi Environmental Engineering Section Department of Civil EngineeringAligarh Muslim UniversityAligarh202002India

The cultivation of aerobic granules in sequencing batch reactor for the biodegradation of p-cresol was studied. The reactor was started with 100 mg/L of p-cresol. Aerobic granules first appeared within one month of start up. The granules were large and strong and had a compact structure. The diameter of stable granules was in the range of 1-5 mm. The integrity coefficient and granules density was found to be 96% and 1046 kg/m3, raspectively, The settling velocity of granules was found to be in the range of 2×10^-2-6×10^-7 m/sec. The aerobic granules were able to degrade p-cresol upto 800 mg/L at a removal efficiency of 88%. Specific p-cresol degradation rate in aerobic granules followed haldane model for substrate inhibition, high specific p-cresol degradation rate up to 0,96 g pcresol/（g ***） were sustained upto p-cresol concentration of 400 mg/L, higher removal efficiency, good settling characteristics of aerobic granules, makes sequencing batch reactor suitable for erLhaneing the microorganism potential for biodegradation of inhibitory compounds.

关键词： aerobic granules p-cresol sequencing batch reactor (SBR) haldane kinetics equation

Square-root parametrization of dark energy in f(Q)cosmology

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Communications in Theoretical Physics 2023年第12期75卷 105-114页

作者： m Koussour N myrzakulov Alnadhief h A Alfedeel E i hassan D Sofuoğlu Safa m mirgani Quantum Physics and magnetism Team LPMCFaculty of Science Ben M'sikCasablanca Hassan II University L.N.Gumilyov Eurasian National University Ratbay myrzakulov Eurasian international Centre for Theoretical Physics Department of mathematics and Statistics Imam Mohammad Ibn Saud Islamic University(IMSIU) Department of Physics Faculty of ScienceUniversity of Khartoum Centre for Space Research North-West University Department of Physics Istanbul University Vezneciler 34134

This paper is a parametrization of the equation of state(Eo S)parameter of dark energy(DE),which is parameterized using square-root(SR)form i.e.ω_(SR)=ω_(0)+ω_(1)z/√z^(2)+1,where ω_(0)and ω_(1) are free *** parametrization is examined in the context of the recently suggested f(Q)gravity theory as an alternative to general relativity(GR),in which gravitational effects are attributed to the non-metricity scalar Q with the functional form f(Q)=Q+αQ^(n),whereαand n are arbitrary *** derive observational constraints on model parameters using the hubble dataset with 31 data points and the Supernovae(SNe)dataset from the Pantheon samples compilation dataset with 1048 data *** the current model,the evolution of the deceleration parameter,density parameter,EoS for DE,and Om(z)diagnostic have all been *** has been shown that the deceleration parameter favors the current accelerated expansion *** has also been shown that the EoS parameter for DE has a quintessence nature at this time.

关键词： cosmology dark energy f(Q)gravity EoS parameter

Effect of diode size and series resistance on barrier height and ideality factor in nearly ideal Au/n type-GaAs micro Schottky contact diodes

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Chinese Physics B 2010年第10期19卷 477-484页

作者： m. A. Yeganeh sh. Rahmatallahpur A. Nozad R. K. mamedov Faculty of Physics Baku State University Academic Zahid Xlilov Küsi-23 AZ 1148 Iran material Research School POB 55515196 Binab Iran

Small high-quality Au/n type-GaAs Schottky barrier diodes （SBDs） with low reverse leakage current are produced using lithography. Their effective barrier heights （Bhs） and ideality factors from current-voltage （i-V） characteristics are measured by a Pico ampere meter and home-built i-V instrument. in spite of the identical preparation of the diodes there is a diode-to-diode variation in ideality factor and barrier height parameters. measurement of topology of a surface of a thin metal film with atomic force microscope （AFm） shows that Au-n type-GaAS SD consists of a set of parallel-connected micro and nanocontacts diodes with sizes approximately in a range of 100-200 nm. Between barrier height and ideality factor there is an inversely proportional dependency. With the diameter of contact increasing from 5 μm up to 200 μm, the barrier height increases from 0.833 up to 0.933 eV and its ideality factor decreases from 1.11 down to 1.006. These dependencies show the reduction of the contribution of the peripheral current with the diameter of contact increasing. We find the effect of series resistance on barrier height and ideality factor.

关键词： Schottky barrier diodes conducting probe-atomic force microscope barrier height andideality factor

Q-Switching Pulse Operation in 1.5-μm Region Using Copper Nanoparticles as Saturable Absorber

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Chinese Physics Letters 2017年第3期34卷 41-44页

作者： A.R.muhammad m.T.Ahmad R.Zakaria h.R.A.Rahim S.F.A.Z.Yusoff K.S.hamdan h.h.m.Yusof h.Arof S.W.harun Department of Electrical Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Photonics Research Centre Physics DepartmentFaculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia

We demonstrate a passively Q-switched erbium-doped fiber laser （EDFL） using a copper nanoparticle （CuNP） thin film as the saturable absorber in a ring cavity. A stable Q-switched pulse operation is observed as the CuNP saturable absorber （SA） is introduced in the cavity. The pulse repetition rate of the EDFL is observed to be proportional to the pump power, and is limited to 101.2khz by the maximum pump power of 113.7mW. On the other hand, the pulse width reduces from 10.19μs to 4.28μs as the pump power is varied from 26.1 mW to 113.7mW. The findings suggest that CuNP SA could be useful as a potential saturable absorber for the development of the robust, compact, efficient and low cost Q-switched fiber laser operating at 1.5-μm region.

关键词： Cu m Region Using Copper Nanoparticles as Saturable Absorber Q-Switching Pulse Operation in 1.5 SA khz EDF

STURm-LiOUViLLE PROBLEmS WiTh EiGENDEPENDENT BOUNDARY AND TRANSmiSSiONS CONDiTiONS

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Acta mathematica Scientia 2005年第4期25卷 731-740页

作者： Z.Akdog■an m.Demirci O.sh.mukhtarov Department of mathematics Faculty of Science-Art Gaziosmanpas■a University 60100 Tokat TurkeyDepartment of Mathematics Faculty of Science-Art Gaziosmanpas■a University 60100 Tokat TurkeyDepartment of Mathematics Faculty of Science-Art Gaziosmanpas■a University 60100 Tokat Turkey

The purpose of this paper is to extend some fundamental spectral properties of regular Sturm-Liouville problems to special kind discontinuous boundary value problem, which consist of a Sturm-Liouville equation with piecewise continuous potential together with eigenvalue parameter on the boundary and transmission conditions. The authors suggest their own approach for finding asymptotic approximations formulas for eigenvalues and eigenfunctions of such discontinuous problems.

关键词： Sturm-Liouville problems transmission conditions asymptotic of eigenvalues and eigenfunctions discontinuous boundary-value problems

microstructural evolution,dislocation density and tensile properties of Al–6.5Si–2.1Cu–0.35mg alloy produced by different casting processes

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Journal of materials Science & Technology 2021年第36期95卷 145-157页

作者： S.Samat m.Z.Omar A.h.Baghdadi i.F.mohamed A.Rajabi A.m.Aziz Department of mechanical and manufacturing Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangiUKM 43600Malaysia

Al–Si–Cu–mg foundry alloys are used in casting process ***,their strength properties remain low due to their microstructural characteristics and *** this work,the microstructural characteristics,dislocation densities,and mechanical properties of Al–Si–Cu–mg cast alloys prepared through different casting methods were studied *** casting processes,namely,gravity casting(GC),rheocasting(RC),thixoforming(Thixo),and Thixo with heat treatment,were *** GC and RC samples had mainly dendriticα-Al phase microstructures and exhibited coarse Si particles and intermetallic compounds in their interdendritic *** contrast,the Thixo and heat-treated Thixo(hT-Thixo)samples exhibited microstructural refinement with uniformly distributedα-Al globules,fine fibrous Si particles,and fragmented intermetallic compounds amongα-Al *** accumulation of dislocation densities increased in the Thixo sample as the strain was increased due to plastic ***,the ultimate tensile strength and yield strength of the hT-Thixo sample increased by 87%and 63%,respectively,relative to those of the GC *** cleavage fracture displayed by the GC and RC samples led to brittle ***,the Thixo and hT-Thixo samples presented dimple-based ductile fracture.

关键词： Al–Si–Cu–mg alloy Thixoforming microstructure mechanical property Dislocation density

in-vitro assessments of micro arc oxidized ceramic flms on AZ31 magnesium implant: Degradation and cell-surface response

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Progress in Natural Science:materials international 2013年第4期23卷 425-433页

作者： A.Seyfoori sh.mirdamadi m.mehrjoo A.Khavandi School of metallurgy and materials Engineering Iran University of Science and Technology National Cell Bank Pasteur Institute of Iran

in this research,phosphate and silicate based ceramic flms were synthesized via micro arc oxidation(mAO) method on the surface of the magnesium *** the aim of orthopedic application of these coatings,corrosion behavior of them was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy in simulated body fuid(SBF) *** results indicated better corrosion resistance of the phosphate flm compared to the silicate ***,based on immersion tests,less ph and weight changes were obtained for the phosphate ***(G292) Cell response of the coated specimens showed better cell morphology on the surface of the phosphate flm than silicate flm after 6 and 24 h of *** was related to the more surface roughness and less degradation rate of the phosphate flm compared with silicate coating.

关键词： Corrosion magnesium G292 cell micro arc oxidation

Optimization of aerodynamic efficiency for twist morphing mAV wing

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Chinese Journal of Aeronautics 2014年第3期27卷 475-487页

作者： N.i.ismail A.h.Zulkifli m.Z.Abdullah m.hisyam Basri Norazharuddin shah Abdullah Faculty of mechanical Engineering Universiti Teknologi MARA Shah Alam 40450 Malaysia School of mechanical Engineering Universiti Sains Malaysia Engineering Campus Nibong Tebal 14300 Malaysia School of materials and mineral Resources Engineering Universiti Sains Malaysia Engineering Campus Nibong Tebal 14300Malaysia

Twist morphing （Tm） is a practical control technique in micro air vehicle （mAV） flight. however, Tm wing has a lower aerodynamic efficiency （CL/CD） compared to membrane and rigid wing. This is due to massive drag penalty created on Tm wing, which had overwhelmed the succes- sive increase in its lift generation. Therefore, further CL/CDmax optimization on Tm wing is needed to obtain the optimal condition for the morphing wing configuration. in this paper, two-way fluid- structure interaction （FSi） simulation and wind tunnel testing method are used to solve and study the basic wing aerodynamic performance over （non-optimal） Tm, membrane and rigid wings. Then, a multifidelity data metamodel based design optimization （mBDO） process is adopted based on the Ansys-DesignXplorer frameworks. in the adaptive mBDO process, Kriging metamodel is used to construct the final multifidelity CL/CD responses by utilizing 23 multi-fidelity sample points from the FSi simulation and experimental data. The optimization results show that the optimal Tm wing configuration is able to produce better CL/CDmax magnitude by at least 2% than the non-optimal Tm wings. The flow structure formation reveals that low TV strength on the optimal Tm wing induces low CD generation which in turn improves its overall CL/CDmax performance.

关键词： Aerodynamics Fluid structure interaction micro air vehicle Optimization Twist morphing

Structural, m?ssbauer spectroscopy, magnetic properties, and thermal measurements of Y(3-x)Dy_x Fe_5O_(12)

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Chinese Physics B 2018年第10期27卷 558-564页

作者： mahdi Lataifeh Qassem i mohaidat Sami h mahmood ibrahim Bsoul mufeed Awawdeh ibrahim Abu-Aljarayesh mu'ath Altheeba Physics Department Yarmouk University Irbid 21163 Jordan Physics Department The University of Jordan Amman 11942 Jordan Physics Department AI al-Bayt University Mafraq 13040 Jordan

Yttrium iron garnet powder samples（Y3-xDyxFe5O12）, where part of yttrium ions are substituted by dysprosium ions with different concentrations are prepared by the solid state reaction method. The properties of the prepared samples are examined by different methods such as x-ray diffraction（XRD）, mssbauer spectroscopy, macroscopic magnetization measurements, and thermal measurements. The XRD measurements show that all the samples reveal the presence of a single garnet phase with a BCC structure. Room temperature mssbauer spectra indicate that iron ions occupy three magnetic sites, i.e., two octahedral sites and one tetrahedral site. The saturation magnetization and the initial magnetic susceptibility decrease with the increase of Dy^3＋ substitution. The Curie temperature obtained from the thermal measurements seems to be independent of Dy^3＋ substitution.

关键词： mossbauer spectroscopy magnetic properties x-ray diffraction differential scanning calorimetry